reassign.t   [plain text]

#!perl -I..

# Readonly reassignment-prevention tests

use strict;
use Test::More tests => 22;

# Find the module (1 test)
BEGIN {use_ok('Readonly'); }

use vars qw($s1 @a1 %h1 $s2 @a2 %h2);

Readonly::Scalar $s1 => 'a scalar value';
Readonly::Array  @a1 => 'an', 'array', 'value';
Readonly::Hash   %h1 => {a => 'hash', of => 'things'};

my $err = qr/^Attempt to reassign/;

# Reassign scalar
eval {Readonly::Scalar $s1 => "a second scalar value"};
like $@ => $err, 'Readonly::Scalar reassign die';
is $s1 => 'a scalar value', 'Readonly::Scalar reassign no effect';

# Reassign array
eval {Readonly::Array @a1 => "another", "array"};
like $@ => $err, 'Readonly::Array reassign die';
ok eq_array(\@a1, [qw[an array value]]) => 'Readonly::Array reassign no effect';

# Reassign hash
eval {Readonly::Hash %h1 => "another", "hash"};
like $@ => $err, 'Readonly::Hash reassign die';
ok eq_hash(\%h1, {a => 'hash', of => 'things'}) => 'Readonly::Hash reassign no effect';


# Now use the naked Readonly function

SKIP:
{
	skip 'Readonly \\ syntax is for perls earlier than 5.8', 7  if $] >= 5.008;

	eval q{
		Readonly \$s2 => 'another scalar value';
		Readonly \@a2 => 'another', 'array', 'value';
		Readonly \%h2 => {another => 'hash', of => 'things'};
	};

	# Reassign scalar
	eval q{Readonly \$s2 => "something bad!"};
	like $@ => $err, 'Readonly Scalar reassign die';
	is $s2 => 'another scalar value', 'Readonly Scalar reassign no effect';

	# Reassign array
	eval q{Readonly \@a2 => "something", "bad", "!"};
	like $@ => $err, 'Readonly Array reassign die';
	ok eq_array(\@a2, [qw[another array value]]) => 'Readonly Array reassign no effect';

	# Reassign hash
	eval q{Readonly \%h2 => {another => "bad", hash => "!"}};
	like $@ => $err, 'Readonly Hash reassign die';
	ok eq_hash(\%h2, {another => 'hash', of => 'things'}) => 'Readonly Hash reassign no effect';

	# Reassign real constant
	eval q{Readonly \"scalar" => "vector"};
	like $@ => qr/^Modification of a read-only value attempted at \(eval \d+\),? line 1/, 'Reassign indirect via ref';
};

SKIP:
{
	skip 'Readonly $@% syntax is for perl 5.8 or later', 6  unless $] >= 5.008;

	eval q{
		Readonly $s2 => 'another scalar value';
		Readonly @a2 => 'another', 'array', 'value';
		Readonly %h2 => {another => 'hash', of => 'things'};
	};

	# Reassign scalar
	eval q{Readonly $s2 => "something bad!"};
	like $@ => $err, 'Readonly Scalar reassign die';
	is $s2 => 'another scalar value', 'Readonly Scalar reassign no effect';

	# Reassign array
	eval q{Readonly @a2 => "something", "bad", "!"};
	like $@ => $err, 'Readonly Array reassign die';
	ok eq_array(\@a2, [qw[another array value]]) => 'Readonly Array reassign no effect';

	# Reassign hash
	eval q{Readonly %h2 => {another => "bad", hash => "!"}};
	like $@ => $err, 'Readonly Hash reassign die';
	ok eq_hash(\%h2, {another => 'hash', of => 'things'}) => 'Readonly Hash reassign no effect';
};


# Reassign real constants
eval q{Readonly::Scalar "hello" => "goodbye"};
like $@ => $err, 'Reassign real string';
eval q{Readonly::Scalar1 6 => 13};
like $@ => $err, 'Reassign real number';